Eldon Hill is a limestone hill in Derbyshire, England. It has a large quarry on it's NW side and a natural pothole just to the south of it's peak. It also has the remains of lead mines scattered across it.
The image below (from this location on Google Maps) shows a number of horizontal, linear bands (marked with yellow arrows) of what appear to be indentations in the ground running across the surface of the hill for a distance of ~300m each. What are they, and how were they formed?